summaryrefslogtreecommitdiff
path: root/cesar/ecos/packages/io/serial/current/misc/timeout.inl
blob: 25a70d8cf5f044c94668083470eada097cd13661 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
#ifndef CYGONCE_IO_SERIAL_MISC_TIMEOUT_INL
#define CYGONCE_IO_SERIAL_MISC_TIMEOUT_INL
//==========================================================================
//
//        timeout.inl
//
//        Simple timeout support for serial I/O testing.
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):     gthomas
// Contributors:  gthomas
// Date:          1999-02-05
// Description:   Simple timeout functions
//####DESCRIPTIONEND####

// Timeout support

typedef void (timeout_fun)(void *);
#ifndef NTIMEOUTS
#define NTIMEOUTS 8
#endif
typedef struct {
    cyg_int32     delta;  // Number of "ticks" in the future for this timeout
    timeout_fun  *fun;    // Function to execute when it expires
    void         *arg;    // Argument to pass when it does
} timeout_entry;
static timeout_entry timeouts[NTIMEOUTS];
static cyg_handle_t timeout_alarm_handle;
static cyg_alarm timeout_alarm;
static cyg_int32 last_delta;

static void
do_timeout(cyg_handle_t alarm, cyg_addrword_t data)
{
    int i;
    cyg_int32 min_delta;
    timeout_entry *e = timeouts;
    min_delta = 0x7FFFFFFF;  // Maxint
    for (i = 0;  i < NTIMEOUTS;  i++, e++) {
        if (e->delta) {
            e->delta -= last_delta;
            if (e->delta == 0) {
                // Time for this item to 'fire'
                (e->fun)(e->arg);
            } else {
                if (e->delta < min_delta) min_delta = e->delta;
            }
        }
    }
    if (min_delta != 0x7FFFFFFF) {
        // Still something to do, schedule it
        cyg_alarm_initialize(timeout_alarm_handle, cyg_current_time()+min_delta, 0);
        last_delta = min_delta;
    }
}

static cyg_uint32
timeout(cyg_int32 delta, timeout_fun *fun, void *arg)
{
    int i;
    cyg_int32 min_delta;
    static bool init = false;
    timeout_entry *e = timeouts;
    cyg_uint32 stamp;
    if (!init) {
        cyg_handle_t h;
        cyg_clock_to_counter(cyg_real_time_clock(), &h);
        cyg_alarm_create(h, do_timeout, 0, &timeout_alarm_handle, &timeout_alarm);
        init = true;
    }
    stamp = 0;  // Assume no slots available
    for (i = 0;  i < NTIMEOUTS;  i++, e++) {
        if ((e->delta == 0) && (e->fun == 0)) {
            // Free entry
            e->delta = delta;
            e->fun = fun;
            e->arg = arg;
            stamp = (cyg_uint32)e;
            break;
        }
    }
    e = timeouts;
    min_delta = 0x7FFFFFFF;
    for (i = 0;  i < NTIMEOUTS;  i++, e++) {
        if (e->delta && (e->delta < min_delta)) min_delta = e->delta;
    }
    if (min_delta != 0x7FFFFFFF) {
        // Still something to do, schedule it
        cyg_alarm_initialize(timeout_alarm_handle, cyg_current_time()+min_delta, 0);
        last_delta = min_delta;
    }
    return stamp;
}

static void
untimeout(cyg_uint32 stamp)
{
    if (stamp != 0) {
        timeout_entry *e = (timeout_entry *)stamp;
        if (e->fun != 0) {
            e->delta = 0;
            e->fun = 0;
            e->arg = 0;
        }
    }
}

#endif // CYGONCE_IO_SERIAL_MISC_TIMEOUT_INL